mirror of https://gitee.com/openkylin/linux.git
470 lines
11 KiB
C
470 lines
11 KiB
C
/*
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* vio driver interface to hvc_console.c
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*
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* This code was moved here to allow the remaining code to be reused as a
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* generic polling mode with semi-reliable transport driver core to the
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* console and tty subsystems.
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*
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*
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* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
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* Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
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* Copyright (C) 2004 IBM Corporation
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*
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* Additional Author(s):
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* Ryan S. Arnold <rsa@us.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* TODO:
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*
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* - handle error in sending hvsi protocol packets
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* - retry nego on subsequent sends ?
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*/
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#undef DEBUG
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/console.h>
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#include <asm/hvconsole.h>
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#include <asm/vio.h>
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#include <asm/prom.h>
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#include <asm/hvsi.h>
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#include <asm/udbg.h>
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#include <asm/machdep.h>
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#include "hvc_console.h"
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static const char hvc_driver_name[] = "hvc_console";
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static struct vio_device_id hvc_driver_table[] = {
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{"serial", "hvterm1"},
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#ifndef HVC_OLD_HVSI
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{"serial", "hvterm-protocol"},
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#endif
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{ "", "" }
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};
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typedef enum hv_protocol {
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HV_PROTOCOL_RAW,
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HV_PROTOCOL_HVSI
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} hv_protocol_t;
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struct hvterm_priv {
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u32 termno; /* HV term number */
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hv_protocol_t proto; /* Raw data or HVSI packets */
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struct hvsi_priv hvsi; /* HVSI specific data */
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spinlock_t buf_lock;
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char buf[SIZE_VIO_GET_CHARS];
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int left;
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int offset;
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};
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static struct hvterm_priv *hvterm_privs[MAX_NR_HVC_CONSOLES];
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/* For early boot console */
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static struct hvterm_priv hvterm_priv0;
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static int hvterm_raw_get_chars(uint32_t vtermno, char *buf, int count)
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{
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struct hvterm_priv *pv = hvterm_privs[vtermno];
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unsigned long i;
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unsigned long flags;
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int got;
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if (WARN_ON(!pv))
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return 0;
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spin_lock_irqsave(&pv->buf_lock, flags);
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if (pv->left == 0) {
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pv->offset = 0;
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pv->left = hvc_get_chars(pv->termno, pv->buf, count);
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/*
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* Work around a HV bug where it gives us a null
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* after every \r. -- paulus
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*/
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for (i = 1; i < pv->left; ++i) {
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if (pv->buf[i] == 0 && pv->buf[i-1] == '\r') {
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--pv->left;
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if (i < pv->left) {
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memmove(&pv->buf[i], &pv->buf[i+1],
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pv->left - i);
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}
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}
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}
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}
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got = min(count, pv->left);
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memcpy(buf, &pv->buf[pv->offset], got);
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pv->offset += got;
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pv->left -= got;
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spin_unlock_irqrestore(&pv->buf_lock, flags);
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return got;
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}
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static int hvterm_raw_put_chars(uint32_t vtermno, const char *buf, int count)
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{
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struct hvterm_priv *pv = hvterm_privs[vtermno];
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if (WARN_ON(!pv))
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return 0;
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return hvc_put_chars(pv->termno, buf, count);
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}
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static const struct hv_ops hvterm_raw_ops = {
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.get_chars = hvterm_raw_get_chars,
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.put_chars = hvterm_raw_put_chars,
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.notifier_add = notifier_add_irq,
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.notifier_del = notifier_del_irq,
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.notifier_hangup = notifier_hangup_irq,
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};
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static int hvterm_hvsi_get_chars(uint32_t vtermno, char *buf, int count)
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{
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struct hvterm_priv *pv = hvterm_privs[vtermno];
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if (WARN_ON(!pv))
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return 0;
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return hvsilib_get_chars(&pv->hvsi, buf, count);
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}
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static int hvterm_hvsi_put_chars(uint32_t vtermno, const char *buf, int count)
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{
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struct hvterm_priv *pv = hvterm_privs[vtermno];
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if (WARN_ON(!pv))
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return 0;
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return hvsilib_put_chars(&pv->hvsi, buf, count);
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}
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static int hvterm_hvsi_open(struct hvc_struct *hp, int data)
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{
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
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int rc;
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pr_devel("HVSI@%x: open !\n", pv->termno);
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rc = notifier_add_irq(hp, data);
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if (rc)
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return rc;
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return hvsilib_open(&pv->hvsi, hp);
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}
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static void hvterm_hvsi_close(struct hvc_struct *hp, int data)
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{
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
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pr_devel("HVSI@%x: do close !\n", pv->termno);
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hvsilib_close(&pv->hvsi, hp);
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notifier_del_irq(hp, data);
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}
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void hvterm_hvsi_hangup(struct hvc_struct *hp, int data)
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{
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
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pr_devel("HVSI@%x: do hangup !\n", pv->termno);
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hvsilib_close(&pv->hvsi, hp);
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notifier_hangup_irq(hp, data);
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}
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static int hvterm_hvsi_tiocmget(struct hvc_struct *hp)
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{
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
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if (!pv)
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return -EINVAL;
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return pv->hvsi.mctrl;
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}
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static int hvterm_hvsi_tiocmset(struct hvc_struct *hp, unsigned int set,
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unsigned int clear)
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{
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struct hvterm_priv *pv = hvterm_privs[hp->vtermno];
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pr_devel("HVSI@%x: Set modem control, set=%x,clr=%x\n",
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pv->termno, set, clear);
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if (set & TIOCM_DTR)
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hvsilib_write_mctrl(&pv->hvsi, 1);
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else if (clear & TIOCM_DTR)
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hvsilib_write_mctrl(&pv->hvsi, 0);
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return 0;
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}
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static const struct hv_ops hvterm_hvsi_ops = {
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.get_chars = hvterm_hvsi_get_chars,
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.put_chars = hvterm_hvsi_put_chars,
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.notifier_add = hvterm_hvsi_open,
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.notifier_del = hvterm_hvsi_close,
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.notifier_hangup = hvterm_hvsi_hangup,
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.tiocmget = hvterm_hvsi_tiocmget,
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.tiocmset = hvterm_hvsi_tiocmset,
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};
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static void udbg_hvc_putc(char c)
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{
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int count = -1;
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if (!hvterm_privs[0])
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return;
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if (c == '\n')
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udbg_hvc_putc('\r');
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do {
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switch(hvterm_privs[0]->proto) {
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case HV_PROTOCOL_RAW:
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count = hvterm_raw_put_chars(0, &c, 1);
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break;
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case HV_PROTOCOL_HVSI:
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count = hvterm_hvsi_put_chars(0, &c, 1);
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break;
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}
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} while(count == 0);
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}
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static int udbg_hvc_getc_poll(void)
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{
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int rc = 0;
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char c;
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if (!hvterm_privs[0])
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return -1;
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switch(hvterm_privs[0]->proto) {
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case HV_PROTOCOL_RAW:
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rc = hvterm_raw_get_chars(0, &c, 1);
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break;
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case HV_PROTOCOL_HVSI:
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rc = hvterm_hvsi_get_chars(0, &c, 1);
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break;
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}
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if (!rc)
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return -1;
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return c;
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}
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static int udbg_hvc_getc(void)
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{
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int ch;
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if (!hvterm_privs[0])
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return -1;
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for (;;) {
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ch = udbg_hvc_getc_poll();
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if (ch == -1) {
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/* This shouldn't be needed...but... */
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volatile unsigned long delay;
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for (delay=0; delay < 2000000; delay++)
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;
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} else {
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return ch;
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}
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}
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}
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static int hvc_vio_probe(struct vio_dev *vdev,
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const struct vio_device_id *id)
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{
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const struct hv_ops *ops;
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struct hvc_struct *hp;
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struct hvterm_priv *pv;
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hv_protocol_t proto;
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int i, termno = -1;
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/* probed with invalid parameters. */
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if (!vdev || !id)
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return -EPERM;
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if (of_device_is_compatible(vdev->dev.of_node, "hvterm1")) {
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proto = HV_PROTOCOL_RAW;
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ops = &hvterm_raw_ops;
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} else if (of_device_is_compatible(vdev->dev.of_node, "hvterm-protocol")) {
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proto = HV_PROTOCOL_HVSI;
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ops = &hvterm_hvsi_ops;
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} else {
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pr_err("hvc_vio: Unknown protocol for %s\n", vdev->dev.of_node->full_name);
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return -ENXIO;
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}
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pr_devel("hvc_vio_probe() device %s, using %s protocol\n",
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vdev->dev.of_node->full_name,
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proto == HV_PROTOCOL_RAW ? "raw" : "hvsi");
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/* Is it our boot one ? */
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if (hvterm_privs[0] == &hvterm_priv0 &&
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vdev->unit_address == hvterm_priv0.termno) {
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pv = hvterm_privs[0];
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termno = 0;
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pr_devel("->boot console, using termno 0\n");
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}
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/* nope, allocate a new one */
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else {
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for (i = 0; i < MAX_NR_HVC_CONSOLES && termno < 0; i++)
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if (!hvterm_privs[i])
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termno = i;
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pr_devel("->non-boot console, using termno %d\n", termno);
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if (termno < 0)
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return -ENODEV;
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pv = kzalloc(sizeof(struct hvterm_priv), GFP_KERNEL);
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if (!pv)
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return -ENOMEM;
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pv->termno = vdev->unit_address;
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pv->proto = proto;
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spin_lock_init(&pv->buf_lock);
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hvterm_privs[termno] = pv;
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hvsilib_init(&pv->hvsi, hvc_get_chars, hvc_put_chars,
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pv->termno, 0);
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}
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hp = hvc_alloc(termno, vdev->irq, ops, MAX_VIO_PUT_CHARS);
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if (IS_ERR(hp))
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return PTR_ERR(hp);
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dev_set_drvdata(&vdev->dev, hp);
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/* register udbg if it's not there already for console 0 */
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if (hp->index == 0 && !udbg_putc) {
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udbg_putc = udbg_hvc_putc;
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udbg_getc = udbg_hvc_getc;
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udbg_getc_poll = udbg_hvc_getc_poll;
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}
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return 0;
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}
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static struct vio_driver hvc_vio_driver = {
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.id_table = hvc_driver_table,
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.probe = hvc_vio_probe,
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.name = hvc_driver_name,
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.driver = {
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.suppress_bind_attrs = true,
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},
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};
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static int __init hvc_vio_init(void)
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{
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int rc;
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/* Register as a vio device to receive callbacks */
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rc = vio_register_driver(&hvc_vio_driver);
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return rc;
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}
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device_initcall(hvc_vio_init); /* after drivers/tty/hvc/hvc_console.c */
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void __init hvc_vio_init_early(void)
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{
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const __be32 *termno;
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const char *name;
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const struct hv_ops *ops;
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/* find the boot console from /chosen/stdout */
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if (!of_stdout)
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return;
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name = of_get_property(of_stdout, "name", NULL);
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if (!name) {
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printk(KERN_WARNING "stdout node missing 'name' property!\n");
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return;
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}
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/* Check if it's a virtual terminal */
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if (strncmp(name, "vty", 3) != 0)
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return;
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termno = of_get_property(of_stdout, "reg", NULL);
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if (termno == NULL)
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return;
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hvterm_priv0.termno = of_read_number(termno, 1);
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spin_lock_init(&hvterm_priv0.buf_lock);
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hvterm_privs[0] = &hvterm_priv0;
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/* Check the protocol */
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if (of_device_is_compatible(of_stdout, "hvterm1")) {
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hvterm_priv0.proto = HV_PROTOCOL_RAW;
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ops = &hvterm_raw_ops;
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}
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else if (of_device_is_compatible(of_stdout, "hvterm-protocol")) {
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hvterm_priv0.proto = HV_PROTOCOL_HVSI;
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ops = &hvterm_hvsi_ops;
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hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
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hvterm_priv0.termno, 1);
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/* HVSI, perform the handshake now */
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hvsilib_establish(&hvterm_priv0.hvsi);
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} else
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return;
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udbg_putc = udbg_hvc_putc;
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udbg_getc = udbg_hvc_getc;
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udbg_getc_poll = udbg_hvc_getc_poll;
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#ifdef HVC_OLD_HVSI
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/* When using the old HVSI driver don't register the HVC
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* backend for HVSI, only do udbg
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*/
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if (hvterm_priv0.proto == HV_PROTOCOL_HVSI)
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return;
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#endif
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/* Check whether the user has requested a different console. */
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if (!strstr(boot_command_line, "console="))
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add_preferred_console("hvc", 0, NULL);
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hvc_instantiate(0, 0, ops);
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}
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/* call this from early_init() for a working debug console on
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* vterm capable LPAR machines
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*/
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#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR
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void __init udbg_init_debug_lpar(void)
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{
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hvterm_privs[0] = &hvterm_priv0;
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hvterm_priv0.termno = 0;
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hvterm_priv0.proto = HV_PROTOCOL_RAW;
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spin_lock_init(&hvterm_priv0.buf_lock);
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udbg_putc = udbg_hvc_putc;
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udbg_getc = udbg_hvc_getc;
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udbg_getc_poll = udbg_hvc_getc_poll;
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}
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#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR */
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#ifdef CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI
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void __init udbg_init_debug_lpar_hvsi(void)
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{
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hvterm_privs[0] = &hvterm_priv0;
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hvterm_priv0.termno = CONFIG_PPC_EARLY_DEBUG_HVSI_VTERMNO;
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hvterm_priv0.proto = HV_PROTOCOL_HVSI;
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spin_lock_init(&hvterm_priv0.buf_lock);
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udbg_putc = udbg_hvc_putc;
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udbg_getc = udbg_hvc_getc;
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udbg_getc_poll = udbg_hvc_getc_poll;
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hvsilib_init(&hvterm_priv0.hvsi, hvc_get_chars, hvc_put_chars,
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hvterm_priv0.termno, 1);
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hvsilib_establish(&hvterm_priv0.hvsi);
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}
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#endif /* CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI */
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